kitten house



.(No Model.)

J. J. BELLMAN av G. T. RITTENHOUSE.

ELECTRIC TRANSFORMER.

,.NO. 605,194. Patented June 7,1898.

NITE

JOllN J. BELLMAN AND CHARLES T. RI'I"ENIIOUSE, OF NElV YORK,

` Anna ELECTRlC TRANSFORM ER..

SPECIFICATION forming part of Letters Patent Applicata firea'Jlme 29,1897.

To (LIZ whom, it muy concern.- A

lle it known that we, JOHN J. BELLMAN and (HL-minas T. RITTENHoUsE,citizens ot the linited States, residing in the city, county, and Stateot' New York, have invented an Improvement in Electric Transformers, ofwhich the following is a specification.

Electric transformers have sometimes been made with circularcores ofrectangular crosssection built up of iron plates around which theprimary and secondary Wires have been wound by hand. In others the corehas con` sisted of a coil of iron wire around which the primary andsecondary wires were Wound. 'lhc primar i and secondary conductors havealso been wound in a coil and iron wire wound by nand, or plates ofmagnetic material sectionally divided have been built up about saidprimary and secondary coils.

It is well known butt-joint in a ferromagnetic circult olersconsiderable resistance to the magnetic fiuX, and in overcoming the sameadditional energy is required. At least one such joint or air-gap ispresent in all types of electric transformers in which the magneticcircuitis composed of magnetic material not entire and continuousalongthe path of' the magnetic flux.

out Joints, laps, butts, being integral.

In the drawings, Figure l is a cross-section of our improvedtransformer. Fig. 2 is a longitudinal section. Figs. 3 and 4 showmodilieations in the shape of the magnetic lield. Fig. shows thepreferable manner of connecting the ends ot' the rings or heads or ofthe cylinder, and Fig. 6 shows details in larger size of the manner ofmaking the cylinder ot segments and insulating the same.

The lield C is composed of magnetic material in the form of plates orsheets, the core being integral with the other parts, and the sheetshave lnortises at 2 and 3 of the proper size and shape for the admissionof the primary and secondary coils, so that the magnetic llux is free tocirculate through the entire field without the resistance due to lap-No. 605,194, dated Tune 7, 1898. Serial No. 642,879. (No model.)

ping plates that are not integral or to the presence of air-gaps.

The term field7 in this specification is to part of suchcircuits'surrounded by the electric conductor.

The mortises should be cut with reference to the position of eachplates, in order that when the plates are put together may besubstantially of circular cross-sec- This, not indispensable, becausethe plates may be cut out approximately as shown either in Fig. 3 orFig. 4, so that when properly assembled they will form one or more coresaround which the coils are placed. These openings may be of any desiredform. It is sometimes advantageous to cut the outer field-plates for theopposite sides of the pile suticiently wide to provide g such plates, asshown at 4t, to form the guides for the spool.

A sectional or divided spool is made use of, consisting of a cylinder E,which may be of paper or other material, with two or more rings or heads7. The spool may be made in one or more pieces, so that it may be placedin position around the eore. The parts of the be joined together andsecured in any desired manner.

It' the spool is made of sheet metal, it is advisable to so construct itas to prevent the circulation of edd -currents This may be accomplishedby the interposition of an insulating-strip, as shown at I, Fig.- (i.The heads or rings 7 can be made in sections and joined in any desiredmanner, such as shown if desired, by laps and rivets, or secured to thecylinder E in any suitable manner, the special object being to provide aspool suiciently strong for windcore. y to be rotated for the purpose ofbuilding up the electric conductor in convolutions around the core, andhence the coils can be wound upon this spool by turn- IOO ing distinctadvantages over those hitherto nearer.

ing the spool by hand or by any suitable l. llhe combination in atransformer, of a mechanism adapted thereto. The spool or ferromagneticfield built up of integral plates cylinder vmay be supported upon wheelsor so mortiscd that when the plates are properly 5o rollers, as sliownat lt, lFigf. l and 3, "which assembled the core of the magnetic Vlieldwill act as guides, and it may then be rotated in be approximatelycircular in cross section, the manner above stated, or it may be rotatedsubstantially as set forth. by the guide rollers or Wheels themselves,2. 'lliie combination in a transformer, ot a which can be revolved byany suitable power. 'ferromagnetic field, composed of mortised 55 lnWindin g the primary and secondary coils plates, a divided spool orspools interlinlcing 5 and 6 the coils may be combined or grouped Withthe magnetic iield, and means for eausin any desiredmanner.llahowevenpreferto ing the spool or spools to revolve, substan- Wind theprimary and secondary wires in sepatially as set forth. rate coils, asshown in Figs. 2 and t. rlhese 3. lhe combination in a transformer, oi'a 6o coils when side by side around the core are ferromagnetic held, aspool or spools inter advantageously separated by rings', which linkingwith such iield and rollers 'tor supmay also form the heads of thespools, so that porting the said spool or spools and `ior causif anydefect arises in any coilstlie coil may ing them to revolve about thecore or cores of be easily unwound or removed and another the magneticlield, substantially as set forth. 6 5 substituted. y il. Thecombination in a transformer, of a lt i s of course understood that tlieprimary ferromagnetic iield of integral plates each coils and secondarycoils may be connected having a mortise through it and a sectionalelectrically in any desired manner in their or divided spool or spoolsinterlinking with respective circuits. lt may be advantageous to usestrips or bands for either primary or secondary conductors, or for both,as illustrated in the section llig. 2 at 6. lt is also core or cores ofsaid ferromagnetic field, sub' advantageousto fill the mortised space oithe stantially as set forth. ield as completely as possible with thecoils. 5. lhe combination in a transformer, of a 75 By the presentimprovements it is possible i ferromagnetic 'lield built up of plates,and a to economically construct transformers havsectional or dividedspool or spools interlink ing with the terrein agnetic field and thewinding oi' vrire around the core or cores of said ondary wires Woundupon said spool or spools by rotating said spool or spools around themade because the field has a minimum magnetic resistance and thereforerequires a minimum magnetizing-current. The coils which surround thecore or cores are Wound vvitli rapidity, so as to avoid consumingunnecessary time threading tlie wires through the mortised fields.rlliis construction also affords a ready means of dividing up the coilsor helices upon the core in such a manner that the primary and secondarycoils are easy of access, and in case of defect or injury an y coilmaybe removed and another substituted with out disturbing the remainingcoils. rElie magnetic leakage and resistance are reduced to a minimum.

l/Ve claim as our inventieiv E spool or spools on the core or cores,substantially as set forth.

6. The combination in a transformer of a ferromagnetic iield built up ofplates, a seo tional or divided spool or spools interlinking i5 With thecore and rollers for supporting the spool while being rotated,substantially as set forth.

Signed by us this 23d day of June, 1897.

JOHN J. BELLMAN. CHAS. T. RlT'lENlIOUSE.

TWitnesses:

HAROLD SERRELL, Guo. T. Pinounnv,

the :ferromagnetic field and primary and scc- 7o ferromagnetic iield bythe turning of. said 8o

